Vascular tone

The Vascular Tunic. Formation of images on the retina include three processes: Refraction of light rays; accommodation of the lens; and constriction of the pupil. The pupil and lens are housed in the Vascular Tunic.

centromere is the primary constriction and constriction other than primary constriction is called secondary constriction. it is useful in the recognition of a chromosome from the set.

Vasopressor therapy is a medical strategy that aims to improve blood pressure and other hemodynamic parameters by utilising various drugs that act to promote the constriction of various vascular pathways.

Primary homeostasis includes vascular constriction and platelet plug( aggregate plug) formation in response to bleeding. Mainly vessel function and platelet function are mainly concerned in primary homeostasis.